Color segregation and visual search

Bundesen, Claus; Pedersen, Leif Flemming · 1983 · OpenAlex-citations

DOI: 10.3758/bf03202901

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Summary

This study investigates the mechanisms of visual search in color-coded alphanumeric displays, specifically addressing how perceptual grouping influences search efficiency. The authors sought to clarify whether visual search involves sequentially examining individual items or groups of items formed by Gestalt principles of proximity and similarity. The research was motivated by conflicting theories regarding whether non-target items are rejected individually or as preattentive groups, and whether color coding facilitates search through parallel feature detection or sequential group examination. The experiment employed reaction time methods with five subjects who identified whether a target item, distinguished by a specific color, was a letter or a digit. Stimuli consisted of alphanumeric characters arranged in a 5x5 matrix, varying in the number of items (9, 17, or 25) and the number of colors (2, 4, or 6). Two display types were used: "organized" displays, where same-colored noise items were clustered in spatial proximity, and "scrambled" displays, where colors were assigned randomly. Additionally, subjects provided subjective estimates of the number of phenomenally separate groups in scrambled displays to model search behavior. Results showed that in organized displays, mean reaction time increased linearly with the number of colors, with additive effects from the number of items. This indicated that subjects sequentially examined groups of same-colored items, with a search rate of approximately 25 milliseconds per group. In scrambled displays, reaction times were longer and showed a strong interaction between the number of colors and items. Crucially, search times for scrambled displays were accurately predicted by a model using subjective estimates of the number of separate perceptual groups. The model assumed that functional search units were either individual phenomenal groups or unions thereof, capturing 96.5% of the variance in reaction times. The findings support the hypothesis that visual search for a target color involves sequentially examining nonoverlapping groups of same-colored items, unitized according to Gestalt principles, until the target group is found. This challenges accounts proposing parallel, preattentive detection of simple features like color under varied mapping conditions. Instead, the study suggests a multilevel processing strategy where groups are tested for color and individual items for identity. The results imply that the efficiency of color coding in visual search depends heavily on the spatial organization of colors, as grouping reduces the number of units that must be sequentially examined.

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• visual search